os.system ubuntu terminal and python

Question

When I echo a txt document and my service works perfectly, i use the terminal. Here is the command that works: echo $(<piece.txt ) | nc 127.0.0.1 9988

When I try to do the same command in python using os. os.system("echo '$(<piece.txt )' | nc 127.0.0.1 9988")

I have tried all kinds of parenthesis options and different options that wont work.

My preference is to actually echo a string variable. If someone can help me either echo a text doc or echo a string variable it would be much appreciated! Thanks :)

Why would you use os.system() for that at all? Use the Python socket library and you won't have any need for nc in the first place. — Charles Duffy
– Charles Duffy, Commented Feb 18, 2021 at 2:25

Luiz Amaral · Accepted Answer · 2021-02-18 01:59:41Z

2

I'm guessing that's because echo $(<piece.txt) is a bashism and will work only in some shells.

I'm not sure of what is in piece.txt. Maybe you could do something like:

os.system("echo $(cat piece.txt) | nc 127.0.0.1 9988")

Maybe it's possible to use redirections as well:

os.system("nc 127.0.0.1 9988 < piece.txt")

answered Feb 18, 2021 at 1:59

Luiz Amaral

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groovyflash Over a year ago

I ended up getting it to work with something like this -

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